Cat tree tower



FIG. 1 is a front, left and top perspective view of a cat tree tower showing my new design;

FIG. 2 is a rear, right and bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged partial view of FIG. 6 .

The broken lines in the figures illustrate portions of the cat tree tower that form no part of the claimed design. 

CLAIM The ornamental design for a cat tree tower, as shown and described. 